Can Sinopec Gas Be Added to a Half Tank of PetroChina Gas?

2 Answers
StVera
07/29/25 7:43am
Sinopec 95 can be mixed with PetroChina 95. Whether gasoline can be mixed depends on the gasoline grade, not the manufacturer, meaning gasoline of the same grade can be mixed. Although Sinopec 95 can be mixed with PetroChina 95, it is not recommended to mix them frequently. Although both Sinopec 95 and PetroChina 95 are produced according to the same specifications and meet national standards, it is best to stick to one brand. After all, the crude oil processing procedures and additives used by the two are always different. Long-term mixing may easily lead to engine shaking and carbon deposits in the combustion chamber. Below is more related information: Differences between Sinopec and PetroChina: 1. Raw materials: PetroChina mainly uses crude oil from oil fields in northern China, while Sinopec relies on imported crude oil as there are few oil fields in southern China. 2. Additives: Sinopec uses imported crude oil additives, and its oil quality is slightly better than PetroChina's. 3. Production technology: Sinopec uses world-leading crude oil refining technology, and its refined oil has a higher density than PetroChina's.
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DeGarrett
08/12/25 10:59am
I've been driving for almost twenty years and often fill up with Sinopec gas when my tank is half full of PetroChina fuel, never encountering any issues. Gasoline, after all, adheres to national standards, with minimal differences in formulations between brands, so mixing them won't affect engine performance. The key is to stick to the same octane rating, like 92 or 95, and avoid mixing different grades. This approach offers flexibility and savings—you can take advantage of Sinopec promotions without waiting to empty your tank for a specific brand. Some drivers worry about different additives corroding the engine, but modern cars are built tough, and such minor variations are negligible. After mixing, I've noticed stable fuel consumption and no difference in driving feel.
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